BMW 8 Series (G15) (2018) is 213 mm (8.39 inch) longer and 124 mm (4.88 inch) wider than Mercedes CLA-Class (2016).
Mercedes CLA-Class (2016) is 97 mm (3.82 inch) higher, 439 kg (968 lbs) lighter and has 50 liters (1.77 ft3) bigger cargo space than BMW 8 Series (G15) (2018).